Move cert/private key to stack to satisfy Valgrind
Move cert/private key to stack to satisfy Valgrind

Valgrind started detecting the mallocs in this test as a
memory leak when I touched an unrelated part of the test.
I fixed the leak to satisfy Valgrind, but we need a deeper
investigation. See issue: https://github.com/awslabs/s2n/issues/1533

wcs1only/s2n,colmmacc/s2n,awslabs/s2n,awslabs/s2n,PKRoma/s2n,PKRoma/s2n,colmmacc/s2n,wcs1only/s2n,awslabs/s2n,colmmacc/s2n,wcs1only/s2n,PKRoma/s2n,alexeblee/s2n,alexeblee/s2n,PKRoma/s2n,alexeblee/s2n,PKRoma/s2n,awslabs/s2n,wcs1only/s2n,wcs1only/s2n,wcs1only/s2n,colmmacc/s2n,alexeblee/s2n,PKRoma/s2n,wcs1only/s2n,alexeblee/s2n,awslabs/s2n,colmmacc/s2n,PKRoma/s2n,PKRoma/s2n,awslabs/s2n,alexeblee/s2n,colmmacc/s2n,wcs1only/s2n